Device for forming beads in sand-molds



(No Model.)

O. B. ISBESTER.

DEVICE FOR FORMING BEADS IN SAND MOLDS.

No. 344,657. Patented June 29, 1886 Q/VUm mooeo J; 5440014 on I 35 GPVCGLMMJ,

N. PETERS, PhQYO-Mhcqraphnr. Washingtom 9.6

rrn STATES CALEB B. ISBESTER, OF GHATTANOOGA, TENNESSEE.

DEVICE FOR FORMING BEADS IN SAND-MOLDS.

SPECIFICATION forming part of Letters Patent No.

344,657, dated June 29,1886.

Application filed March 30, 1886. Serial N0.19 .155. (No model.) A

To (rZZ whom it may concern.-

Be it known that I, CALEB B. IsBEsTER, a citizen of the United States,residing at Chattanooga, in the county of Hamilton and State of Tennessee, have invented certain new and useful Improvements in Devices for Forming Female Beads in SandMolds; and I do declare the following to be a full, clear, and exact description of the invention, such as will enable others skilled in the art to which it appertains to make and use the same, reference being had to the accompanying drawings, and to the letters and figures of reference marked thereon, which form a part of this specification.

Figure 1 is a top view of a flask rammed up, with bell-mouth pattern for its head, and the bead-forming device and centering spider in position for operation. Fig. 2 is a vertical central section through Fig. 1 in the plane indicated by dotted line 00 w thereon, part of the figure being broken away. Fig. 3 is an enlarged diainetri cal section through the beadforming device and lower part of its shaft. Fig. 4 is a section,on line 00 x of Fig. 3, of the bead-forming device without its casing. Fig. 5 is a top view of the grooved bottom of the said device.

My invention relates to improvements in devices for forming female beads in the ends of sand-molds adapted for casting pipes having male beads on their ends,whicl1 improvements will be fully understood from the following description when taken in connection with the annexed drawings.

Referring to the drawings by letters,A designates a cast-metal flask, which is preferably made of two longitudinal parts hinged together on one side,and provided with suitable fastenings onthe opposite side in the usual wellknown manner. This flask is formed of a barrel having a flanged flaring head or belhmouth on one end and a flange, a, on the other end, by which latter and bolts or other fastenings the flanged chill-plate A is secured to the bottom of the flask. This chill-plateis constructed with a central conical frustum, b, the vertical axis of which should coincide with the vertical axis of the flask and its flaring head, as shown in Fig. 1,which frustum forms a centering device for the pattern,and also for the core, which are used in the well-known manner,and not shown in the drawings.

B designates the sand-mold, which is first rammed in the flask, between it and the pattern; and G designates the bell-mouth pattern constructed, as shown in Figs. 1 and 2, with a hole, 0, centrally through its ring or top plate, in which is adjusted a removable centeringspider, D, having shouldered arms radiating from a central boss. After the sand has been properly rammed in the flask, the chill-plate A being at the time rigidly secured to the flanged bottom of the flask and the pattern removed, I employ the following device for producing the annular female bead cl in the lower end of the sand-mold B,which head is designed to form a male bead on the smaller end of the finished pipe.

E designates a cylindrical casing of any desired length, and of a diameter corresponding exactly to the internal diameter of the sandmold B. The casing should be of such length or height that it will serve as a guide and prevent forcing of the sand. To the open bottom of this casing I bolt a circular plate, K, diametrically grooved at f, in which groove are two radially-sliding blocks, G G, having their outer ends beveled and rounded to make the exact impression desired in the sand-mold B.

On top of the plate K and sliding blocks G is a disk, H, which is keyed on a vertical shaft, J, that passes freely through the top of the casing E,froely through the bottom plate, K, and has a nut, g, tapped on its lower end. This bottom plate, K, is a support for the slides G, to hold them in place. The disk H is provided with eccentric slots h h, through which pins '0 i pass,that are fixed into the sliding blocks G G.

It will be observed by reference to Figs. 3 and 5 that the bottom plate, K, is cut away at 13 i, the termini of its groove f, for the purpose of allowing the extreme outer ends of the sliding blocks G G to ice-retracted flush with the periphery of the casing E, and also to prevent accumulation of sand. It will also be observed that these blocks can be protruded beyond the periphery of said casing, or retracted, as above stated, by simply turning the shaft J, a handcrank being applied on the upper end of this shaft for the purpose.

WVhen the device has been lowered into the sand-mold in the flask, and rested upon the chill-plate A, the spider D is adjusted in its ICO place upon the core-print for exactly centering the said shaft in the flask. The molder then tur'ns the shaft in the proper direction, which operation first protrudes the ends of the sliding blocks beyond the periphery of the casing E. The blocks and easing are then rotated together, and the annular'female bead formed in the sand. The shaft J is then turned in an opposite direction to that above named, which will cause the sliding blocks to be retracted, and allow the device to be withdrawn from the mold, carrying with it the spider or upper shaft bearing, D. The core print or pattern for the head is now withdrawn, the core introduced, and the metal which forms the pipe poured.

Among the advantages of mybead forming device are that the impression for the bead, when the pipe is cast head up, is easily and quickly made, and after its formation does not require the removal of the flask to another bottom piece or chill-plate before pouring the metal, the.pipe being cast directly upon the plate upon which the sand is rammed, and that it insures the core being truly central in the mold for the pipe; hence the axis of the core will exactly coincide with that of the mold. I do not limit myself to two reciprocating blocks, G G, as a greater number may be used, especially for pipes of very large diameter.

Having described my invention, I olaim vice, of the grooved bottom plate, K, having recesses f f at the termini of the groove, the bead-formers guided by and adapted to slide radially in the. groove in said plate, and pro; vided with pins 71, the disk H, slotted eccentrically and receiving in these slots said pins, the shaft J, keyed to the disk, and provided with a nut, g, and the cylindrical cap or casing E, all constructed and adapted to operate substantially as and for the purposes described. ,In testimony whereof I affix my signature in presence of two witnesses.

CALEB B. ISBESTER. Witnesses:

HARRY W. DURAND, J. B. ALLIN. 

